[BUGS] BUG #14877: DISCARD ALL incorrectly resets user parameters

The following bug has been logged on the website:

Bug reference:      14877
Logged by:          Dmitriy Riabov
Email address:      dmitriy@riabov.info
PostgreSQL version: 10.0
Operating system:   Debian 8
Description:

Affected versions: 9.4 - 10. Versions prior to 9.4 haven't been tested.

How to reproduce the bug:

# psql testdb

testdb=# select current_setting('var.test');
ERROR:  unrecognized configuration parameter "var.test"
testdb=# select set_config('var.test', '123', false);set_config 
------------123
(1 row)

testdb=# select current_setting('var.test');current_setting 
-----------------123
(1 row)

testdb=# discard all;
DISCARD ALL
testdb=# select current_setting('var.test');current_setting 
-----------------
(1 row)



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